[jeeperjohn]

Does antone know what the flow rate for a 4.0 HO fuel injector is?
Thanks,
John

 

[jeeperjohn]

I found it. If you are building a stroker or a megaSquirt system, ,this will come in handy.

The following is a list of the injectors used on the 4.0L since 1987 along with their rated static flow:

Model Year, Part #, Colour, Fuel Pressure, Static Flow,
'87-'90, 53003956, Dark Tan, 39psi, 18.6lb/hr
'91'-93, 33007127, Brown, 39psi, 21.0lb/hr
'94-'95, 53030343, Tan, 39psi, 21.0lb/hr
'96-'99, 53030778, Grey, 49psi, 23.2lb/hr
'99-'01, 04854181, Blue tip, 49psi, 22.5lb/hr

The injector flow rate varies as the square root of the pressure drop across the injector. The stock '91-'95 4.0 injectors are rated at 22lb/hr @ 43psi fuel pressure, so at 39psi they flow ( sq. rt.(39/43) x 22.0 = 21.0 ).
For stock/modified 4.0 engines or stroker build-ups the following injectors can be installed. The flow rates are:

Ford Motorsport 19.0lb/hr @ 39psi (Part no. FMS-M9593-C302)
Ford Motorsport 24.0lb/hr @ 39psi (Part no. FMS-M9593-A302)
Ford Motorsport 30.0lb/hr @ 39psi (Part no. FMS-M9593-B302)
Chevy LT1 24.0lb/hr @ 43.5psi (Part no. 17124248)
Chevy LT4 28.0lb/hr @ 43.5psi (Part no. 17124251)
'98 Chevy LS1 25.2lb/hr @ 58.0psi (Part no. 12533952)
'99-'00 Chevy LS1 26.2lb/hr @ 58.0psi (Part no. 12456154)
'01-'02 Chevy LS1/LS6 28.6lb/hr @ 58.0psi (Part no. 12482704)
Accel 19.2lb/hr @ 44.1psi (ACC-150119)
Accel 21.1lb/hr @ 44.1psi (ACC-150121)
Accel 24.4lb/hr @ 44.1psi (ACC-150124)
Accel 25.6lb/hr @ 44.1psi (ACC-150126)
Accel 29.4lb/hr @ 44.1psi (ACC-150130)

The '95 Jeep 5.2 ZJ/Dodge 5.9 injectors (Part no. 53030262) are rated to flow 24.6lb/hr at 39psi.

From http://www.jeep4.0performance.4mg.com/index.html

 

[517]

Great post! Thanks for the info.